#include<iostream>
using namespace std;
int main() {
	int a, b, flag = 0;
	int c[20];
	cin >> a >> b;

	for (int i = 0; i < a; i++) {
		cin >> c[i];
		if (b == c[i]) {
			cout << i;
			flag = 1;
		}
	}
	if (flag == 0)
		cout << "Not Found";
	return 0;
}